package com.yufei.controller;

import com.sun.org.apache.bcel.internal.ExceptionConst;
import com.sun.org.apache.xerces.internal.impl.xpath.regex.REUtil;
import com.yufei.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传与下载
 */
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //获取源文件名
        String originalFilename = file.getOriginalFilename();
        //文件后缀
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID重新生成文件名
        String fileName = UUID.randomUUID().toString() + suffix;

        //创建一个目录
        File dir = new File(basePath);
        //判断当前目录是否存在
        if(!dir.exists()){
            //目录不存在，创建
            dir.mkdirs();
        }
        try {
            //将文件转存到指定文件
            file.transferTo(new File(basePath + fileName));
            System.out.println("==============================================");
            System.out.println("basePath"+basePath+"/"+fileName);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }
    /**
     * 文件下载
     */
    @GetMapping("/download")
    public void download(String name , HttpServletResponse response) {
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
